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Type: Journal article
Title: Improvement of palladium limit of detection by microwave-assisted laser induced breakdown spectroscopy
Author: Al Shuaili, A.A.
Al Hadhrami, A.M.
Wakil, M.A.
Alwahabi, Z.T.
Citation: Spectrochimica Acta Part B: Atomic Spectroscopy, 2019; 159:105666-1-105666-7
Publisher: Elsevier
Issue Date: 2019
ISSN: 0584-8547
Statement of
Ahlam A. Al Shuaili, Ahlam M. Al Hadhrami, M.A. Wakil, Zeyad T. Alwahabi
Abstract: Detecting elements such as heavy metals is important in many industrial processes. The techniques currently used are time consuming and require excessive sample preparation. In this paper, we demonstrate microwave-assisted laser-induced breakdown spectroscopy (MW-LIBS) to detect palladium (Pd) in solid samples at ambient conditions. Microwave radiation was introduced by a near field applicator to couple the microwave radiation with the plasma. The results were a 92–fold enhancement in palladium signal with 8-fold improvement in the limit of detection at laser energy levels below 5 mJ (1250 J/cm² laser pulse fluence). We also investigate the optimum experimental parameters of palladium detection for both laser-induced breakdown spectroscopy (LIBS) and MW-LIBS. The maximum signal to noise ratio improvement was achieved at microwave power of 750 W and laser pulse fluence of 157 J/cm² for Pd I 340.46 nm. Finally, we examine the location of the near field applicator (NFA) with respect to the sample to show that the MW-LIBS signal strength was significantly affected by the vertical position compared to the horizontal. The detection limits of palladium with LIBS and MW-LIBS were 40 ppm and 5 ppm respectively.
Keywords: Laser-induced breakdown spectroscopy; microwave assisted; signal enhancement; palladium detection
Rights: © 2019 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.sab.2019.105666
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Chemical Engineering publications

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